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通过对 9号煤层及其顶底板岩性的研究 ,得出如下结论 :9号煤层煤层厚度变化很大 ,但层位稳定 ,在现代开采技术条件下应属大部可采煤层 ;9号煤层顶板K4灰岩厚度不稳定、相变大 ,须注意小于 0 .5m厚度顶板范围及相变部位的顶板管理 ;9号煤层底板为高岭石粘土岩 ,遇水易膨胀底鼓 ,对综采机械化生产可造成影响
Through the study on No.9 coal seam and its top and bottom plate lithology, the following conclusions are drawn: The thickness of No.9 coal seam varies greatly, but the layer is stable and should be the most of the coal seam under the condition of modern mining technology; No.9 Coal seam roof K4 limestone thickness instability, large phase change, should pay attention to less than 0.5m thickness of the roof area and the top of the phase change site management; 9 coal seam floor kaolinite clay rock, easy to expand the water drum, Mining mechanization can have an impact